391362530868 has 72 divisors (see below), whose sum is σ = 1005786530112. Its totient is φ = 128283927552.

The previous prime is 391362530857. The next prime is 391362530869. The reversal of 391362530868 is 868035263193.

It is a happy number.

391362530868 is a `hidden beast` number, since 3 + 9 + 1 + 3 + 625 + 3 + 0 + 8 + 6 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391362530869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1251121 + ... + 1532327.

Almost surely, 2^391362530868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391362530868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (502893265056).

391362530868 is an abundant number, since it is smaller than the sum of its proper divisors (614423999244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

391362530868 is a wasteful number, since it uses less digits than its factorization.

391362530868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281861 (or 281856 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

It can be divided in two parts, 3913625 and 30868, that added together give a palindrome (3944493).

The spelling of 391362530868 in words is "three hundred ninety-one billion, three hundred sixty-two million, five hundred thirty thousand, eight hundred sixty-eight".